AC-7400 - 12 Channel Modbus Controller | RKI

AC-7400 Analog Controller

AC-7400 Controller

12 Channel Gas Monitoring


  • 12 Channel Wired Monitor That Supports Any 4-20 mA Wired Sensor
  • 12 to 35 VDC Operating Voltage with an Optional AC Power Supply
  • Operating Temperature Range of -40ºC to +70ºC
  • Graphical LCD with LED Backlight
  • 5 Push-Button Interface (ADD, MENU, SUB, SCAN/ HOLD and RESET/ESC)
  • 4 Individually Configurable Alarm Set-Points – Four Front Panel ALARM LED Indicators (Red); 4 Dry- Contact Relays (4 Amps Maximum per Relay)
  • Status LEDs for Power and Fault – Multi-Color Status Light; Amber Fault LED for Indicating System Faults
  • Output options: Wet contact DC fault terminal, relay 4 can optionally be configured as a fault relay, RS-485 Modbus
  • NEMA-4X Standard fiberglass enclosure with clear window
  • 1-Year limited hardware warranty
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The AC-7400 Controller is a versatile wired monitor that comes standard with DC power and can be configured with AC power supply. Four relays can be individually set up to the full scale of the channel and may be set up to either latching or non-latching. Supports 12 individual 4-20 mA wired sensor assemblies that can monitor and display a variety of toxic gases, leading to safer working environment.

The AC-7400 controller represents the latest leading edge technology in fixed gas detection today.

Related Services

Fixed Systems Turnkey Solutions

  • Design, Consultations, and Engineering
  • Installation
  • Start-up
  • Training
  • System Maintenance


  • Petrochemical plants
  • Refineries
  • Water & wastewater treatment plants
  • Pulp & paper mills
  • Manufacturing facilities
  • Automotive
  • Semiconductor plants
  • Chemical plants


Product Type 12 Channel wired gas monitor controller
Operating Voltage 12V to 35V DC or 120V AC
Current Draw 300 mA maximum (8 channel)

325 mA maximum (12 channel)

Protection Power electromagnetic interference (EMI) filter

4-20 mA surge suppression

RS-485 and RS-232 surge suppression

Display Screen 160 x 104 Resolution graphical LCD screen transflective (sunlight readable)

with LED back light

Interface 5 Push-buttons (MENU, ADD, SUB, SCAN/HOLD and RESET/ESC)
Product Mounting 4 Mounting feet, 6 in. W x 12-1/4 in. T (included)

maximum mounting bolt/screw size of 5/16 in. (8mm) diameter

Temperature Range -40°C to +70°C
Product Compatibility M2A, S2, GD-70D, T2A T3A, VOC Pro transmitters
Wired (Analog) Input 12 analog inputs, 4-20mA
Relays • 4 Dry-contact relays with 4 amp replaceable fuses

• Fault terminal

• Optional to disable alarm relay

• Latching and non-latching relay settings

Enclosure Materials NEMA-4X enclosure with clear window
Product Dimensions 12 in, L x 10 in. W x 6 in. H (Max. dimensions with attachments)
Total Weight 12.15 lbs
Hardware Warranty 1-Year limited
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